The most reliable way to end a hand-sewn seam
The strongest finish for hand sewing is a backstitch followed by a buried knot. Sew three or four backstitches in place at the end of your seam, then bring your needle up through the fabric a quarter-inch away. Pull the thread taut, then slide your needle through the fold of fabric between the two layers for about half an inch before bringing it back out. Pull gently — the knot will slip inside the fold and disappear. Trim the thread close to the fabric.
This method works because the knot sits inside the seam allowance where it cannot catch or unravel. The backstitches before it lock the thread in place, so even if the knot eventually loosens, the seam stays closed. This is the finish used in garment construction and upholstery because it holds through washing and wear.
If you are sewing something decorative where the back will show, you can use a straightforward knot instead — just tie one close to the fabric and trim. For items that will take stress (seams on clothing, bag handles, cushion covers), the buried knot is worth the extra step.
Key Takeaways
- Always backstitch three or four times at the end of your seam before finishing, because a knot alone will not hold under any tension.
- The buried knot method — sliding the knot inside the fabric fold — keeps it hidden and prevents it from catching or coming loose during use.
- For decorative seams where the back does not show, a straightforward knot close to the fabric is acceptable and faster.
- Trim thread close to the fabric after knotting to prevent fraying and to keep loose ends from catching.
- Practice the buried knot on scrap fabric first, because the motion of sliding the needle through the fold takes a few tries to feel natural.
Backstitching before you knot
Do not tie a knot and call it done. A knot by itself will slip through the fabric or come undone the first time the seam takes any pull. You need backstitches to lock the thread in place first.
When you reach the end of your seam, backstitch by pushing your needle backward through the last stitch you made, then forward again through fresh fabric. Repeat this three or four times in the same spot. The stitches will overlap and create a tight cluster that cannot unravel. Only after you have backstitched should you tie off.
How to tie a buried knot
After your backstitches, bring your needle up through the fabric about a quarter-inch away from where your thread exits. You now have a loop of thread on the surface. Wrap the thread around your needle once or twice, then pull the needle through the loop to create a knot.
Before you tighten the knot all the way, slide your needle into the fold of fabric (the space between the two layers of cloth you are joining) and push it through for about half an inch. Bring the needle back out through the fabric. Now pull the thread gently — the knot will slip inside the fold as you pull, and it will disappear between the layers.
This works because the knot is now inside the seam allowance, where it cannot catch on anything and cannot work its way loose. Trim the thread close to where it exits the fabric.
When to use a straightforward knot instead
If you are sewing something decorative — embroidery on a pillow cover, a patch on a quilt, appliqué work — and the back of the fabric will not be seen, you can use a straightforward knot instead. Tie the knot close to the fabric surface and trim the thread short. The knot will be visible, but that is acceptable for decorative work.
Do not use a straightforward knot for seams that will take stress: the sides of a garment, bag handles, cushion covers, or anything that will be washed or pulled. The knot will slip and the seam will come apart. Stick with the buried knot for anything functional.
Finishing thread ends on different fabric types
On woven fabric (cotton, linen, wool), the buried knot works smoothly because the weave holds the knot in place. On knit fabric (jersey, stretch cotton), the knot can sometimes slip through the loops. If you are sewing knits by hand, make your backstitches slightly longer and tighter, and consider making five or six backstitches instead of three or four before you tie off.
On very delicate fabrics (silk, chiffon, lace), a buried knot can sometimes create a visible bump. Test on a scrap first. If the bump shows, use a straightforward knot instead and accept that it will be visible — the alternative is a seam that fails.
For thick fabrics (denim, canvas, upholstery), the buried knot is ideal because the extra layers give the knot plenty of room to hide. You may need to use a needle with a larger eye and stronger thread to push through multiple layers.
Common mistakes that cause seams to fail
The most common mistake is tying a knot without backstitching first. A knot alone has nothing to grip and will slip out of the fabric within a few wears. Always backstitch before you knot.
The second mistake is pulling the buried knot too hard. If you yank the thread while the knot is sliding into the fold, you can break the thread or pull the knot back out. Pull gently and let the knot slip in on its own.
The third mistake is leaving the thread too long after knotting. A long tail can catch on things, fray, or work its way loose. Trim close to the fabric — you should see only a tiny bit of thread sticking out.
Practice on scrap fabric first
The buried knot takes practice. Your first attempts may result in a knot that does not slip into the fold, or a thread that breaks, or a knot that sits on the surface instead of disappearing. This is normal.
Cut a piece of scrap fabric — an old sheet or cotton remnant works well — and sew a few practice seams. Finish each one with backstitches and a buried knot. After three or four tries, the motion will feel natural and you will develop a sense of how hard to pull and how to angle the needle to make the knot slip smoothly into the fold.
Frequently Asked Questions
Can I use a single knot instead of backstitching?
No. A single knot has nothing to grip and will slip through the fabric or come undone quickly. Always backstitch three or four times before you tie a knot. The backstitches lock the thread in place so the knot does not have to hold all the tension by itself.
What if my buried knot does not disappear into the fold?
The knot is too large or you did not pull hard enough. Try wrapping the thread around your needle only once instead of twice, and pull more firmly (but not so hard you break the thread). If the knot still will not slip in, use a straightforward knot on the surface instead — it is not ideal, but it is better than a visible bump.
How close should I trim the thread after knotting?
Trim as close to the fabric as you can without cutting the fabric itself. You should see only a tiny stub of thread, about an eighth of an inch. A longer tail can catch and fray. If you leave the thread too long, it may work its way loose over time.
Is the buried knot method the same for all hand-sewing stitches?
Yes. Whether you are using a running stitch, backstitch, or whip stitch, finish with backstitches and a buried knot. The method does not change — only the stitch you use to sew the seam changes.
What thread should I use so the knot does not slip?
Use thread made for hand sewing — it is slightly thicker and stronger than machine thread. Polyester or cotton-wrapped polyester holds knots better than pure cotton. Avoid very thin thread or embroidery floss for seams that will take stress, because the knot can slip through the weave.